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Preoperative evaluation of cardiac risk using dobutamine-thallium imaging in vascular surgery
J L Zellner1, B M Elliott, J G Robison
1Department of Surgery, Medical University of South Carolina, Charleston 29425.
Insights
Dobutamine-thallium imaging effectively identifies patients with coronary artery disease undergoing peripheral vascular surgery. This noninvasive test predicts high risk for perioperative myocardial ischemia, guiding surgical decisions.
Area of Science:
- Cardiology
- Vascular Surgery
- Nuclear Cardiology
Background:
- Coronary artery disease (CAD) is common in patients needing peripheral vascular surgery.
- Noninvasive methods are crucial for assessing CAD risk in this population.
Purpose of the Study:
- To evaluate the effectiveness of dobutamine-thallium imaging in detecting significant CAD.
- To assess the risk of perioperative myocardial ischemia in vascular surgery patients based on imaging results.
Main Methods:
- Eighty-seven patients scheduled for vascular reconstruction underwent dobutamine-thallium imaging.
- Abnormal scans were correlated with cardiac catheterization, surgical outcomes, and perioperative events.
Main Results:
- Abnormal scans (48/87) indicated significant CAD in 11/14 patients who underwent catheterization.
- Patients with normal scans had a 5% incidence of perioperative ischemia; those with ischemia but no revascularization had a 40% incidence.
Conclusions:
- Dobutamine-thallium imaging is a sensitive and reliable tool for screening CAD in vascular surgery candidates.
- Identifying high-risk patients allows for appropriate preoperative management to reduce perioperative myocardial ischemic events.
Abstract:
Coronary artery disease is frequently present in patients undergoing evaluation for reconstructive peripheral vascular surgery. Dobutamine-thallium imaging has been shown to be a reliable and sensitive noninvasive method for the detection of significant coronary artery disease. Eighty-seven candidates for vascular reconstruction underwent dobutamine-thallium imaging. Forty-eight patients had an abnormal dobutamine-thallium scan. Twenty-two patients had infarct only, while 26 had reversible ischemia demonstrated on dobutamine-thallium imaging. Fourteen of 26 patients with reversible ischemia underwent cardiac catheterization and 11 showed significant coronary artery disease. Seven patients underwent preoperative coronary bypass grafting or angioplasty. There were no postoperative myocardial events in this group. Three patients were denied surgery on the basis of unreconstructible coronary artery disease, and one patient refused further intervention. Ten patients with reversible myocardial ischemia on dobutamine-thallium imaging underwent vascular surgical reconstruction without coronary revascularization and suffered a 40% incidence of postoperative myocardial ischemic events. Five patients were denied surgery because of presumed significant coronary artery disease on the basis of the dobutamine-thallium imaging and clinical evaluation alone. Thirty-nine patients with normal dobutamine-thallium scans underwent vascular reconstructive surgery with a 5% incidence of postoperative myocardial ischemia. Dobutamine-thallium imaging is a sensitive and reliable screening method which identifies those patients with coronary artery disease who are at high risk for perioperative myocardial ischemia following peripheral vascular surgery.